Maintenance – Nova-Tech Chem-Tech Series 100-150 User Manual

Page 8

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All air must be purged from the pump head before the pump will pump against pressure. Turn on the power to the pump.
Loosen the locking lever by turning it counter-clockwise and turn the output adjusting knob counter-clockwise to full
capacity, (one full turn only) then tighten the locking lever by turning clockwise to a hand tight position. Solution should be
primed to the head within a few minutes. (Refer to Figure K)

Air Bleed Operation: A) While pump is running, turn adjustment screw counterclockwise. B) Run with valve open until a
solid stream of fluid comes out of the bypass tubing (0.25 in (0.63 cm) ID x 0.38 in (0.96 cm) OD) supplied with valve, no
air bubbles. C) Close air bleed valve by turning adjustment screw clockwise.

NOTE:
The feeder is adjustable only while running; never force the output adjustment knob. Do not turn the adjustment
knob while the pump is stopped. If the solution hasn't reached the head in a few minutes, disconnect power to the pump,
make sure the system is depressurized, remove the discharge tubing and discharge fitting and dampen the discharge
valve area (ball check and valve seats) with a few drops of solution being fed by the pump. For safety, use protective
gloves and safety glasses and a proper container to hold chemical. Replace the fitting and tubing and restart the pump.

Turn the power on once more and adjust the pump to the proper rate, using the locking lever as before.

When working on or around metering pump installation, protective gloves and safety glasses

should be worn at all times.

Check calibration of the pump before leaving the installation site. A test for chemical residual in

the treated water is the best indication of the correct pump setting.

MAINTENANCE:

SCALE: GASKETS AND CHECK VALVES
When checking the metering pump or providing routine maintenance, replace all valve seats or ball checks if any of them
show any wear or deterioration. (Valve seats should be checked approximately every 4-6 months depending upon the
application.) Repeated deterioration of valve seats and other rubber or plastic parts within a few months period usually
indicates another material should be used for the defective part. Contact your supplier or see the parts list for parts
affected for possible alternate materials.

OUTSIDE INSTALLATION:
In many areas where freezing conditions are not a problem it is common to install a metering pump outside. Adequate
protection should be provided to keep the pump from being exposed to direct sunlight or rain. Any simple covering
adequately ventilated will afford the necessary protection from weather. NOTE: When discharge tubing is exposed to
direct sunlight, black polyethylene tubing should be used in lieu of the stiff white translucent tubing supplied with each
pump.

SOLUTION TANK:
Check the solution tank for settling of chemicals. If there is sludge on the bottom of the solution tank, clean the strainer,
the foot valve, and the solution tank. Installing the foot valve a few inches above the bottom of the tank will prevent future
clogging. NOTE: If the chemical being pumped regularly precipitates out of solution or does not dissolve easily or
completely (calcium hydroxide), mixers are readily available in different motor configurations and mountings.


OUTPUT ADJUSTING KNOB:
Sometimes the output adjusting knob can move on its shaft and cause a false
output indication. This can happen if the knob set-screw slips or if the unit is
disassembled for any reason. The unit can be reset to "0" as follows:
1. Remove the dial stop.
2. With the pump running, loosen the locking lever and turn the adjusting

knob counter-clockwise until it is "loose" to touch.

3. SLOWLY re-screw the knob clockwise, using very light finger pressure. It

will soon start to advance in pulses as the internal cam comes in and out
of contact.

4. When light finger pressure will no longer allow movement of the knob between cam contacts, grasp the knob securely

and tighten the locking lever (turning clockwise) making sure that the knob does not move. To check for zero point,
turn on pump. There should be no liquid coming out of discharge fitting.

5. Replace dial stop.

6. If the pointer is not at "0", loosen the set-screw on the knob (use a .078 in Hex key), and turn pointer to "0", then

retighten the set-screw while holding the knob in place.

FIG K

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